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Ultrasound-assisted extraction of a condensed tannin and its application for removal dyes from water
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ZHANG, Xue

; PAN, Hongfang

; ZHAO, Wei

; ZHAO, Fang

; ZHANG, Qiang

Food Science and Technology

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2023, Volume 43 elocation e125622

Resumo: En | Texto: En | PDF: En

Abstract The woody oil industry generates a large amount of seed shell waste during its production. Therefore, this paper employs a central composite design (CCD) methodology to optimize the ultrasonic-assisted extraction process, thus utilizing the byproduct. The infrared spectrum and thermogravimetric analysis is adopted to explore the chemical structure and thermal stability of tannin. Besides, the tannin resin (TF) is prepared to elaborate its adsorbing performance for dyes in water. The results verify the role of ultrasonic-assisted extraction method in increasing yield rate. The optimal conditions are as follows: 60% ethanol as extraction solvent, the solid-liquid ratio of 1:25 (g/mL), ultrasonic power of 160 W, and extracted at 80oC for 60min. The yield rate of tannin under such conditions stands at 32.04% (w/w). Temperature is vital for the extraction rate. Acer truncatum tannin as a condensed tannin, performs favorable thermal stability, and TF effectively absorbs cationic dye in water. The maximum adsorption capacity of methylene blue peaks at 176.13 mg/g. Acer truncatum shell serves as a resource of condensed tannin, and Acer truncatum tannin resin can be potentially developed into a new biomass adsorbent.

https://doi.org/10.1590/fst.125622

THE RELATIONSHIP BETWEEN JUMPING AND SPRINTING PERFORMANCE IN TEENAGE SPRINTERS
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Liang, Tseching

; Zhang, Biyu

; Cheng, Shih-Chung

; Sato, Kimitake

; Chen, Wenjia

; Zhang, Xue Bing

Revista Brasileira de Medicina do Esporte

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2023, Volume 29 elocation e2022_0010

Resumo: En Es Pt | Texto: En Es Pt | PDF: En | PDF: Es | PDF: Pt

ABSTRACT Objectives: This study aimed to examine the relationship between vertical jumping at forces of specific time phase and sprint performance in teenage sprinters. Methods: Fifteen male teenage sprinters (age: 14±2 years, height: 168±2 cm, weight: 61±1 kg) participated in the study. The subjects performed the following bilateral/unilateral jumps on a force platform: a) squat jump (SJ), b) unilateral SJ (USJ), c) 40cm drop jump (DJ), and d) 20cm unilateral DJ (UDJ). The 60m sprint test was administered on the second day. Brower split timers were positioned to record subjects’ 5m, 10m, 50m and 60m split times. The variables for inclusion were vertical jump height, maximum force, and force output at 120ms in all jumps and sprint time measures. Results: The results of the Pearson Product Moment Correlation analysis showed that SJ120ms was correlated to 5m and USJ120ms was correlated to 10m. UDJ120ms showed a stronger correlation with 50m than DJ120ms. Although significant correlations using maximum force and height were observed, there were inconsistent results between bilateral and unilateral jumps. Conclusion: Our results highlighted that jumps that have similar form with certain force outputs at specific event timing could more precisely predict sprint performance in teenage sprinters. USJ120ms and UDJ120ms could better predict the acceleration (10m) and high-speed phase (50m) in sprint performance, respectively. Moreover, coaches and practitioners should be cautious when using only jump height or maximum force to predict sprint performance, since the results could be inaccurate when specific movement variables are not thoughtfully considered. Level of evidence III.

RESUMEN Objetivos: Este estudio tuvo como objetivo examinar la relación entre el salto vertical y la fuerza en tiempo específico y el desempeño del sprint en velocistas adolescentes. Métodos: Participaron en el estudio quince adolescentes varones velocistas (edades: 14 ± 2 años, estatura: 168 ± 2 cm, peso: 61 ± 1 kg). Los individuos realizaron los siguientes saltos bilaterales y unilaterales en una plataforma de fuerza: a) squat jump (SJ), b) SJ unilateral (USJ), c) drop jump (DJ) de 40 cm e d) DJ unilateral (UDJ) de 20 cm. La prueba de sprint de 60 m se realizó el segundo día. Los cronómetros en el entrenamiento fraccionado se ajustaron para registrar tiempos de 5 m, 10 m, 50 m y 60 m. Las variables que se incluyeron fueron la altura del salto vertical, la fuerza máxima y la salida de fuerza a 120 m en todos los saltos y mediciones del tiempo del sprint. Resultados: Los resultados del análisis de correlación producto-tiempo de Pearson revelaron que el SJ de 120 m estaba correlacionado con 5 m y el USJ de 120 m estaba correlacionado con 10 m. El UDJ de 120 m tuvo una mayor correlación con el DJ de 50 m que con el de 120 m. Aunque se observaron correlaciones significativas con la fuerza y la altura máximas, algunos resultados fueron inconsistentes entre los saltos bilaterales y unilaterales. Conclusiones: Nuestros resultados pusieron de manifiesto que los saltos con una forma similar a determinadas salidas de fuerza en un tiempo específico del evento pueden predecir con mayor precisión el desempeño en el sprint en adolescentes velocistas. El USJ de 120 m y el UDJ de 120 m pueden predecir mejor, respectivamente, la aceleración (10 m) y la fase de alta velocidad (50 m) en el desempeño del sprint. Además, los entrenadores y practicantes deben ser cautelosos a la hora de utilizar únicamente la altura del salto o la fuerza máxima para predecir el desempeño en el sprint, ya que los resultados pueden ser inexactos cuando no se tienen en cuenta con precisión las variables específicas del movimiento. Nivel de evidencia III.

RESUMO Objetivos: Este estudo teve como objetivo examinar a relação entre o salto vertical e a força em tempo específico e o desempenho de sprint em velocistas adolescentes. Métodos: Quinze adolescentes velocistas do sexo masculino (idade: 14 ± 2 anos, estatura: 168 ± 2 cm, peso: 61 ± 1 kg) participaram do estudo. Os indivíduos realizaram os seguintes saltos bilaterais e unilaterais em uma plataforma de força: a) squat jump (SJ), b) SJ unilateral (USJ), c) drop jump (DJ) de 40 cm e d) DJ unilateral (UDJ) de 20cm. O teste de sprint de 60 m foi realizado no segundo dia. Os cronômetros rastreadores para treinos fracionados foram posicionados para registrar os tempos fracionados de 5 m, 10 m, 50 m e 60 m. As variáveis para inclusão foram altura do salto vertical, força máxima e saída de força a 120 m em todos os saltos e medidas de tempo do sprint. Resultados: Os resultados da análise da correlação produto-tempo de Pearson mostraram que o SJ de 120 m foi correlacionado com 5 m e USJ de 120 m foi correlacionado com 10 m. O UDJ de 120 m teve correlação mais forte com DJ de 50 m do que de 120 m. Embora tenham sido observadas correlações significativas com força e altura máximas, alguns resultados foram inconsistentes entre os saltos bilaterais e unilaterais. Conclusões: Nossos resultados destacaram que os saltos com forma semelhante a certas saídas de força no tempo específico do evento podem prever com mais precisão o desempenho no sprint em adolescentes velocistas. O USJ de 120 m e o UDJ de 120 m podem prever melhor, respectivamente, a aceleração (10 m) e a fase de alta velocidade (50 m) no desempenho no sprint. Além disso, treinadores e praticantes devem ser cautelosos ao usar apenas a altura do salto ou a força máxima para prever o desempenho no sprint, uma vez que os resultados podem ser imprecisos quando variáveis específicas do movimento não forem consideradas com precisão. Nível de evidência III.

https://doi.org/10.1590/1517-8692202329022022_0010i

CARDIOPULMONARY ENDURANCE AND FITNESS TRAINING STRATEGIES FOR OBESE ADOLESCENTS
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Zhang, Xue

; Zheng, Xiangping

Revista Brasileira de Medicina do Esporte

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2023, Volume 29 elocation e2022_0744

Resumo: En Es Pt | Texto: En Es Pt | PDF: En | PDF: Es | PDF: Pt

ABSTRACT Introduction: Reducing the risk of obesity and maintaining healthy lifestyle habits and physical exercise is very important for adolescents in a crucial period of their development. Objective: Study the effect of physical training on cardiopulmonary resistance and physical fitness in obese adolescents. Methods: Fourteen overweight or obese adolescent students were selected from a school. The experiment lasted four weeks, and the experimental group received a systematic and professional physical training intervention, with two aerobic and two endurance training sessions each week. The control group did not perform any physical exercises except free activities in physical education classes. Results: After four weeks of training, the BMI index of the experimental group changed from 32.84 to 27.68, systolic blood pressure also changed from 118.14mmHg to 93.93mmHg, and diastolic blood pressure was from 69.83mmHg to 55.34mmHg. Conclusion: Elevating professional physical training in adolescents’ physical education has shown to be an important attitude to reduce and prevent obesity and its comorbidities. Level of evidence II; Therapeutic studies - investigation of treatment outcomes.

RESUMEN Introducción: La reducción del riesgo de obesidad y el mantenimiento de hábitos de vida saludables además del ejercicio físico son muy importantes para los adolescentes que se encuentran en un periodo crucial de su desarrollo. Objetivo: Estudiar el efecto del entrenamiento físico sobre la resistencia cardiopulmonar y la forma física en adolescentes obesos. Métodos: Se seleccionaron catorce estudiantes adolescentes con sobrepeso u obesidad en un centro escolar. El experimento duró cuatro semanas en las que el grupo experimental recibió una intervención sistemática y profesional de entrenamiento físico, con un total de dos sesiones de entrenamiento aeróbico y dos de resistencia cada semana. El grupo de control no realizó ejercicios físicos, salvo actividades libres en las clases de educación física. Resultados: Después de 4 semanas de entrenamiento, el índice de IMC del grupo experimental cambió de 32,84 a 27,68, la presión arterial sistólica también cambió de 118,14mmHg a 93,93mmHg, y la presión arterial diastólica fue de 69,83mmHg a 55,34mmHg. Conclusión: Aumentar la preparación física profesional en la educación física de los adolescentes demuestra ser una actitud importante para reducir y prevenir la obesidad y sus comorbilidades. Nivel de evidencia II; Estudios terapéuticos - investigación de los resultados del tratamiento.

RESUMO Introdução: A redução do risco de obesidade e a manutenção de hábitos de vida saudáveis além do exercício físico são muito importantes para os adolescentes que estão em um período crucial de seu desenvolvimento. Objetivo: Estudar o efeito do treinamento físico sobre a resistência cardiopulmonar e a aptidão física em adolescentes obesos. Métodos: Catorze estudantes adolescentes obesos ou com excesso de peso foram selecionados em uma escola. A experiência teve duração de quatro semanas onde o grupo experimental recebeu uma intervenção sistemática e profissional de treinamento físico, com um total de dois treinamentos aeróbicos e dois de endurance a cada semana. O grupo de controle não realizou exercícios físicos, exceto as atividades livres nas aulas de educação física. Resultados: Após 4 semanas de treinamento, o índice de IMC do grupo experimental mudou de 32,84 para 27,68, a pressão arterial sistólica também sofreu alterações de 118,14mmHg para 93,93mmHg, e a pressão arterial diastólica foi de 69,83mmHg para 55,34mmHg. Conclusão: Elevar o treinamento físico profissional na educação física dos adolescentes mostra-se uma atitude importante para reduzir e prevenir a obesidade e suas comorbidades. Nível de evidência II; Estudos terapêuticos - investigação dos resultados do tratamento.

https://doi.org/10.1590/1517-8692202329012022_0744

Study of 'Fingerprints' for Green Tea from Different Planting Areas in Eastern China
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Liu, Hai-Yan

; Ma, Lin

; Li, Xing-Heng

; Fan, Jun-Min

; Xing-Ping, Lv

; Cao, Zheng

; Zhang, Xue-Song

South African Journal of Chemistry

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2021, Volume 75 Páginas 28 - 31

Resumo: En | Texto: En | PDF: En

Green tea is one of the main teas in China, which is unfermented and retains more natural substances of fresh tea leaves. This is the preliminary study of application of'fingerprints' based on differences in component composition of green tea. Five green teas from different areas in eastern China are analyzed, which are processed by microwave-assisted solvent (ethanol) extraction method to obtain tea polyphenols, flavonoids, polysaccharides, pigments (thearubigins, theaflavins, theabrownins). The results show that the component composition of five green teas are varied from each other; based on these contents varieties, we have constructed a 'fingerprint' and applied linear discriminant analysis (LDA) and hierarchical cluster analysis (HCA) to assist in the identification of these five green teas. This method does not require large, expensive instruments (such as high performance liquid chromatograph, gas chromatograph, mass spectrometer, etc.), and is easy to use, which provides a new avenue for the identification of tea.

https://doi.org/10.17159/0379-4350/2021/v75a4 15 downloads

Baryon Acoustic Oscillations from Integrated Neutral Gas Observations: an instrument to observe the 21cm hydrogen line in the redshift range 0.13 < z < 0.45 – status update
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WUENSCHE, CARLOS A.

; ABDALLA, ELCIO

; ABDALLA, FILIPE

; BAROSI, LUCIANO

; WANG, BIN

; AN, RUI

; BARRETOS, JOÃO A. M.

; BATTYE, RICHARD

; BRITO, FRANCISCO A.

; BROWNE, IAN

; CORREIA, DANIEL

; COSTA, ANDRÉ A.

; DELABROUILLE, JACQUES

; DICKINSON, CLIVE

; FENG, CHANG

; FERREIRA, ELISA G. M.

; FORNAZIER, KARIN

; DE GASPERIS, GIANCARLO

; GUTIERREZ, PRISCILA

; HARPER, STUART

; LANDIM, RICARDO G.

; LICCARDO, VINCENZO

; MA, YIN-ZHE

; MACHADO, TELMO

; MAFFEI, BRUNO

; MARINS, ALESSANDRO

; MENDES, MILENA M. M.

; MERICIA, EDUARDO

; MONSTEIN, CHRISTIAN

; MOTTA, PABLO

; NOVAES, CAMILA

; OTOBONE, CARLOS H.

; PEEL, MICHAEL

; QUEIROZ, AMILCAR R.

; RADCLIFFE, CHRISTOPHER

; REMAZEILLES, MATHIEU

; RIBEIRO, RAFAEL M. G.

; SANG, YU

; SANTOS, JULIANA F. R.

; SANTOS, LARISSA

; SANTOS, MARCELO. V.

; SHAN, CHENXI

; SILVA, GUSTAVO B.

; VIEIRA, FREDERICO

; VIEIRA, JORDANY

; VILLELA, THYRSO

; XIAO, LINFENG

; YANG, WEIQIANG

; ZHANG, JIAJUN

; ZHANG, XUE

; ZHU, ZENGHAO

Anais da Academia Brasileira de Ciências

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2021, Volume 93 elocation e20201096

Resumo: En | Texto: En | PDF: En

Abstract BINGO (BAO from Integrated Neutral Gas Observations) is a unique radio telescope designed to map the intensity of neutral hydrogen distribution at cosmological distances, making the first detection of Baryon Acoustic Oscillations (BAO) in the frequency band 980 MHz - 1260 MHz, corresponding to a redshift range 0.127 < z < 0.449. BAO is one of the most powerful probes of cosmological parameters and BINGO was designed to detect the BAO signal to a level that makes it possible to put new constraints on the equation of state of dark energy. The telescope will be built in Paraíba, Brazil and consists of two \thicksim 40m mirrors, a feedhorn array of 50 horns, and no moving parts, working as a drift-scan instrument. It will cover a 15 ^{\circ} ∘ declination strip centered at \sim \delta ∼ δ =-15 ^{\circ} ∘, mapping \sim ∼ 5400 square degrees in the sky. The BINGO consortium is led by University of São Paulo with co-leadership at National Institute for Space Research and Campina Grande Federal University (Brazil). Telescope subsystems have already been fabricated and tested, and the dish and structure fabrication are expected to start in late 2020, as well as the road and terrain preparation.

https://doi.org/10.1590/0001-3765202120201096 413 downloads

Effects of spongioplasty on neourethral function following hypospadias repair: an experimental study in rabbits
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Xie, Linhai

; Xi, Yaqi

; Zhang, Xue

; Ding, Hongbiao

; Li, Senkai

International braz j urol

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Jun 2020, Volume 46 Nº 3 Páginas 436 - 443

Resumo: En | Texto: En | PDF: En

ABSTRACT Purpose: Spongioplasty (mobilization and midline approximation of the two branches of the bifid dysplastic distal corpus spongiosum) can form a covering layer for the neourethra to prevent urethrocutaneous fistula in hypospadias repair surgery. However, it remains unclear whether spongioplasty affects neourethral function. The objective of this study was to compare neourethral function after hypospadias repair with and without spongioplasty. Materials and Methods: Fourteen congenital hypospadiac New Zealand male rabbits were randomly allocated into two groups, seven animals underwent Duplay hypospadias repair and spongioplasty (experimental group), while seven underwent Duplay surgery alone (control group). Functional differences between groups were assessed by comparing neourethral compliance and flow rate. Two months after surgery, in vivo neourethral compliance was assessed by measuring intraluminal pressure with a digital pressure meter of an isolated neourethral segment, following progressive distension with 1, 2, and 3mL of air. Penises were harvested for uroflowmetry test using a simple device. Results: Postoperatively, fistula developed in one and zero rabbits in the control and experimental groups, respectively. Mean pressures tended to be higher in the experimental group than in the control group (82.14 vs. 69.57, 188.43 vs. 143.26, and 244.71 vs. 186.29mmHg for 1, 2, and 3mL of air, respectively), but the difference was not statistically significant. Mean flow rates also did not significantly differ between the experimental and control groups (2.93mL/s vs. 3.31mL/s). Conclusion: In this congenital rabbit model, no obvious functional differences were found between reconstructed urethras after hypospadias repair with and without spongioplasty.

https://doi.org/10.1590/s1677-5538.ibju.2019.0453 609 downloads

The Effect of Electropulsing Treatment on Properties of Pre-compressed AZ31 Magnesium Alloy
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Zhu, Xing-xiao

; Zhang, Xue-wen

; Wang, Li-fei

; Chen, Zhi-qing

; Cao, Xiao-qing

Materials Research

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2019, Volume 22 Nº 6 elocation e20190434

Resumo: En | Texto: En | PDF: En

The effect of electropulsing treatment (EPT) on quasi-static compression behavior and anisotropy of AZ31 Mg alloy were investigated based on quasi-static compression test. The results show that the orientation of the sample has a significant effect on the deformation mechanism of metal and this mechanism can be changed by pre-deformation and EPT. However, the strain rate sensitivity of the material is not affected by pre-deformation. Compared with the as-received plates, the anisotropy of AZ31 Mg alloy increased in ND-RD plane after pre-compression along the transverse direction, the ∆YS of specimens increased from 87 MPa to 98 MPa. After EPT, the anisotropy of AZ31 Mg alloy gradually decreased with the change of EPT temperature and EPT time, the ∆YS of the sample reached 14.2 MPa when EPT conducted at 200 ℃ for 15 min, which decreased 72.8 MPa compared with the as-received plates.

https://doi.org/10.1590/1980-5373-mr-2019-0434 462 downloads

Artesunate promotes Th1 differentiation from CD4+ T cells to enhance cell apoptosis in ovarian cancer via miR-142
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Chen, Xiao

; Zhang, Xue-ling

; Zhang, Guo-hua

; Gao, Ying-fang

Brazilian Journal of Medical and Biological Research

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2019, Volume 52 Nº 5 elocation e7992

Resumo: En | Texto: En | PDF: En

The aim of this study was to evaluate the influence of artesunate on Th1 differentiation and its anti-tumor effect on ovarian cancer. A Murine ovarian cancer model was established by ID8 cells transplantation. The expression of miR-142 and Sirt1 proteins in peripheral CD4+ T cells were quantified with qRT-PCR and western blot, respectively. Peripheral CD4+ T cells were induced for Th1 differentiation. The percentages of apoptosis of Th1/CD4+ T cells and ovarian cancer cells were analyzed by flow cytometry. The IFN-γ level was examined through enzyme-linked immunosorbent assay. Artesunate promoted miR-142 expression in peripheral CD4+ T cells and Th1 differentiation from CD4+ T cells. Artesunate promoted cell apoptosis of ovarian cancer cells by inducing Th1 differentiation. By up-regulating miR-142, artesunate suppressed Sirt1 level and promoted Th1 differentiation. Artesunate enhanced the pro-apoptotic effects of Th1 cells on ovarian cancer via the miR-142/Sirt1 pathway. Artesunate promoted Th1 differentiation from CD4+ T cells by down-regulating Sirt1 through miR-142, thereby enhancing cell apoptosis in ovarian cancer.

https://doi.org/10.1590/1414-431x20197992 1073 downloads

Saquinavir plus methylprednisolone ameliorates experimental acute lung injury
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Zhang, Guanghua

; Zhang, Xue

; Huang, Haidi

; Ji, Yunxia

; Li, Defang

; Jiang, Wanglin

Brazilian Journal of Medical and Biological Research

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2018, Volume 51 Nº 10 elocation e7579

Resumo: En | Texto: En | PDF: En

Glucocorticoid insensitivity is an important barrier to the treatment of several inflammatory diseases, including acute lung injury (ALI). Saquinavir (SQV) is an inhibitor of the human immunodeficiency virus protease, and the therapeutic effects of SQV in ALI accompanied with glucocorticoid insensitivity have not been previously investigated. In this study, the effects of SQV on lipopolysaccharide (LPS)-mediated injury in human pulmonary microvascular endothelial cells (HPMECs), human type I alveolar epithelial cells (AT I), and alveolar macrophages were determined. In addition, the effects of SQV on an LPS-induced ALI model with or without methylprednisolone (MPS) were studied. In LPS-stimulated HPMECs, SQV treatment resulted in a decrease of high mobility group box 1 (HMGB1), phospho-NF-κB (p-NF-κB), and toll-like receptor 4 (TLR4), and an increase of VE-cadherin. Compared to MPS alone, MPS plus SQV attenuated the decrease of glucocorticoid receptor alpha (GRα) and IκBα in LPS-stimulated HPMECs. HMGB1, TLR4, and p-NF-κB expression were also lessened in LPS-stimulated alveolar macrophages with SQV treatment. In addition, SQV reduced the injury in human AT I with a decrease of HMGB1 and p-NF-κB, and with an increase of aquaporin 5 (AQP 5). SQV ameliorated the lung injury caused by LPS in rats with reductions in vascular permeability, myeloperoxidase activity (MPO) and histopathological scores, and with lowered HMGB1, TLR4, and p-NF-κB expression, but with enhanced VE-cadherin expression. By comparison, SQV plus MPS increased GRα and IκBα in lung tissues of rats with ALI. This study demonstrated that SQV prevented experimental ALI and improved glucocorticoid insensitivity by modulating the HMGB1/TLR4 pathway.

https://doi.org/10.1590/1414-431x20187579 957 downloads

10.

Rapid assessment of quality of deer antler slices by using an electronic nose coupled with chemometric analysis
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Xu, Guojie

; Liao, Caili

; Ren, Xiaolei

; Zhang, Xue

; Zhang, Xinyue

; Liu, Siqi

; Fu, Xiaorui

; Wu, Haozhong

; Huang, Luqi

; Liu, Chunsheng

; Wang, Xueyong

Revista Brasileira de Farmacognosia

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Dez 2014, Volume 24 Nº 6 Páginas 716 - 721

Resumo: En | Texto: En | PDF: En

Deer antler is a precious animal-sourced traditional Chinese medicine. We aimed to rapidly assess the quality of deer antler slices by electronic nose so that we can ensure medical safety. In this study, response intensity of the electronic nose was favorably optimized, and samples were well assessed by using an electronic nose based on LDA model. The results obtained herein suggested that electronic nose could be an effective method to rapidly assess the quality of deer antler slices, and could also be an important tool for categorization of complex aroma mixtures for the control of quality of drugs or food.

https://doi.org/10.1016/j.bjp.2014.10.011 1175 downloads

11.

The Properties of Optical FEII Emission Lines of AGN with Double-Peaked Broad Emission Lines
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Zhang, Xue-Guang

; Dultzin-Hacyan, Deborah

; Wang, Ting-Gui

Revista mexicana de astronomía y astrofísica

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2007, Volume 43 Nº 1 Páginas 101 - 121

Resumo: En Es | Texto: En Es | PDF: En | PDF: Es

We study the FeII properties of double-peaked broad low-ionization emission line AGN (dbp emitters) using a sample of 27 dbp emitters from SDSS (DR4). Our first result is that the line spectra in the wavelength range from 4100 Å to 5800 Å can be best fitted by an elliptical accretion disk model.The best fitted results indicate that the optical FeII emission lines of dbp emitters originate from the same region in the accretion disk where the double-peaked Balmer emission lines originate. Some correlations between FeII emission lines and the other broad emission lines for normal AGN can be confirmed for dbp emitters. However, these results should be taken with caution due to the small number of objects and the bias in selecting strong FeII emitters. We show that for dbp emitters, BH masses seems to have more influence on FeII properties than dimensionless accretion rate.

Estudiamos las propiedades de una muestra de 27 núcleos activos de galaxias (NAGs) con perfil de doble pico (dbp) en las líneas anchas de emisión de baja ionización, tomados del DR4. Nuestro primer resultado es que todo el espectro de emisión en el intervalo de 4100 Å a 5800 Å se puede ajustar muy bien mediante un modelo de emisión en un disco de acreción elíptico. Los mejores ajustes indican que la emisión óptica de las líneas de FeII en los emisores dbp se originan en la misma región del disco que las líneas de Balmer. Encontramos que algunas correlaciones conocidas para los NAGs normales se cumplen también para los dbp. Sin embargo, este resultado debe tomarse con cautela porque el número de objetos es pequeno y porque tenemos un sesgo de selección hacia objetos con emisión de FeII intensa. Mostramos que para los dbp, la masa del agujero negro central parece tener mayor influencia en las propiedades de la emisión de FeII que la tasa de acreción.

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